Investigation on flow induced impeller vibration characteristics in centrifugal pump

摘要

Based on fluid structure interaction analysis, the fluid force on the impeller and the vibration of the impeller in centrifugal pump are studied at different conditions.For fluid area, the transient flow field of the centrifugal pump is numerically simulated using RANS and SST k-ε turbulence model, the fluid forces in X and Y directions are obtained through integral derived from impeller.It is found that the fluid forces exerted on the impeller are basically periodic variation, and the variation law is related to the number of impeller blades.The fluid forces at different conditions are compared, and it is minimal at the design condition.The law of pressure fluctuations on the spiral volute is almost same at different conditions.The blade frequency plays dominant role to the fluid force and pressure pulsation.For solid structure, finite element method is used to analyze the transient dynamic analysis of the structure, and the radial displacement of the impeller is obtained.The deformation displacement at different conditions is compared.